Granules of pyridinedicarbothioate herbicides

Abstract

The tendency of herbicidal pyridinedicarbothioates to crystallize and thus to partially lose herbicidal activity when formulated into granules is reduced by including in the granules a small, effective amount of a diester of an alkylene dicarboxylic acid.

WHAT IS CLAIMED: 
     
       1. A herbicidal composition comprising a mixture of a pyridinedicarbothioate herbicide and a pyridinedicarbothioate crystallization suppressing amount of an alkylene dicarboxylic acid ester. 
     
     
       2. A granule made from the composition of claim 1. 
     
     
       3. The herbicidal composition of claim 1 wherein the alkylene dicarboxylic acid ester is represented by the formula ##STR3## wherein R is an alkylene radical having from 1 to about 12 carbon atoms and R 1  and R 2  are selected from the group consisting of alkyl radicals having 1 to 12 carbon atoms, substituted or unsubstituted monocarbocylic aryl radicals having from 5 to 12 carbon atoms, substituted or unsubstituted monocarbocylic arylalkyl radicals having from 6 to 15 carbon atoms, alkoxyalkyl radicals having from 2 to 12 carbon atoms, and alkyloxy radicals having from 1 to 12 carbon atoms. 
     
     
       4. The composition of claim 3 wherein the alkylene dicarboxylic acid ester is dibutyl adipate, diisobutyl adipate, di-2-ethylhexyl adipate, diisononyl adipate, diisopropyl adipate, di-n-hexyl adipate, diisodecyl adipate, diethoxyethyl adipate, dibutoxyethyl adipate, dimethoxymethyl adipate or bis(butyldiglycol) adipate. 
     
     
       5. The composition of claim 1 wherein the active herbicide is 3,5-pyridinedicarbothioic acid, 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-, S,S-dimethyl ester. 
     
     
       6. The composition of claim 5 wherein the alkylene dicarboxylic acid ester is dibutyl adipate, diisobutyl adipate, di-2-ethylhexyl adipate, diisononyl adipate, diisopropyl adipate, di-n-hexyl adipate, diisodecyl adipate, diethoxyethyl adipate, dibutoxyethyl adipate, dimethoxylmethyl adipate or bis(butyldiglycol) adipate.